Asteroids with Satellites Database--Johnston's Archive

(6615) Plutarchos

compiled by Wm. Robert Johnston
last updated 19 February 2017

--Orbital and physical data--

(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)

dynamical type, primary: main belt asteroid


orbital data, primary (osculating elements) [JPL] :
semimajor axis a: 2.169992956 AU
orbital period P: 3.196654418 yr
(= 1167.578026 d)
eccentricity e: 0.126321037
perihelion distance q: 1.895877194 AU
aphelion distance Q: 2.444108717 AU
inclination i: 1.796946401°
argument of perihelion ω: 81.27916493°
ascending node Ω: 129.3661601°
mean anomaly M: 63.20408129°
perihelion passage TP: 2013 Oct 30.01195
Epoch: 2014 May 23
data arc: 1960-2013 (964 obs.)
Earth MOID: 0.891599 AU
Jupiter Tisserand invariant TJ: 3.678


orbital data, secondary:
binary dynamical type:A [M09a]
semimajor axis as: 9.7 km [*E]
separation/primary radius as/rp:6.4 [*E]
separation/Hill radius as/rH:0.021 [*E]
orbital period Ps: 1.668 ± 0.004 d [O07a]
eccentricity es: ?
normalized ang. mom. αL: 1.59 [M09a]

other data, system (combined):
absolute mag. H: 14.6 [MPC]
slope parameter G: (0.15) [*A]
effective diameter dE: 3.14 ± 0.04 km [M11b]
geometric albedo: 0.412 ± 0.066 [M11b]
color index U-B: ?
color index B-V: ?
taxonomic type: ?
mass m: ?
density ρ: (1.6 g/cm3) [*A]
Hill radius rH: 450 km [*E]

other data, primary:
diameter dp: 3.05 km [*D]
rotation period RPp: 2.3247 ± 0.0001 h [O07a]
amplitude in mag., rotational ΔM: 0.06 ± 0.01 [O07a]
amplitude in mag., mutual events ΔM:0.07 [O07a]
pole direction Β, λ: ? , ?


other data, secondary:
diameter ds: 0.76 km [*D]
diameter ratio ds/dp: 0.25 [W17a]
component mag. difference ΔM: ?
rotation period RPs: ?

-- (6615) Plutarchos --discovery and notes:

Primary discovered 1960 Oct 17 from Palomar Observatory, California, USA by C. J. van Houten, I. van Houten-Groeneveld, and T. Gehrels. Alternate designation(s): 9512 P-L, 1991 EW. Permanent number assigned 1995 Oct 08.

Named 1996 Apr 04 for Plutarchos (~45-125 AD) [MPC26932].

Companion discovered 2007 Apr 14 using lightcurve observations. Announced 2007 Oct .

--Links, more technical:

--Links, less technical:

--Links to ADS abstracts:


© 2007-2008, 2014, 2017 by Wm. Robert Johnston.
Last modified 19 February 2017.
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